GPT-5.3 Codex vs o1 Pro

Compare OpenAI and OpenAI AI models

OpenAI

GPT-5.3 Codex

OpenAI

o1 Pro

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Cost Comparison (1000 input + 500 output tokens, 100 requests/day)

GPT-5.3 Codex

Per Request:$0.008750

Daily:$0.875

Monthly:$26.25

Yearly:$319.375

o1 Pro

Per Request:$0.45

Daily:$45.00

Monthly:$1,350.00

Yearly:$16,425.00

Cost Differences

+$0.44125

Per Request

+$44.125

Daily

+$1,323.75

Monthly

+$16,105.625

Yearly

o1 Pro costs more than GPT-5.3 Codex

Feature Comparison

Feature	GPT-5.3 Codex	o1 Pro
Provider	OpenAI	OpenAI
Input Price	$1.75/1M tokens	$150.00/1M tokens
Output Price	$14.00/1M tokens	$600.00/1M tokens
Context Window	256,000 tokens	200,000 tokens
Max Output	32,768 tokens	100,000 tokens
Category	coding	flagship
Capabilities	textcode	textvisioncodereasoning
Release Date	3/1/2026	12/17/2024

GPT-5.3 Codex vs o1 Pro: Which Should You Choose?

Choosing between GPT-5.3 Codex and o1 Pro depends on your priorities: cost efficiency, context length, or raw capability. GPT-5.3 Codex is the more affordable option at $1.75/1M input tokens — 99% cheaper than o1 Pro. Meanwhile, GPT-5.3 Codex offers a significantly larger context window at 256,000 tokens vs 200,000 for o1 Pro.

These models target different tiers: GPT-5.3 Codex is a coding model while o1 Pro is flagship. This means they're optimized for different workloads. o1 Pro targets more demanding workloads, while GPT-5.3 Codex provides a cost-effective option for everyday tasks.

Output costs matter too. GPT-5.3 Codex charges $14.00/1M output tokens vs $600.00 for o1 Pro. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. GPT-5.3 Codex has the edge here at $14.00/1M output tokens.

Multimodal capabilities: o1 Pro supports vision (image inputs) while GPT-5.3 Codex is text-only. If your application needs image understanding, this narrows your choice.

Best Use Cases

Choose GPT-5.3 Codex when:

• Budget is a primary concern
• You need a larger context window (256,000 tokens)
• You're already using OpenAI's API ecosystem

Choose o1 Pro when:

• You need more capabilities (vision, reasoning)
• You need longer outputs (up to 100,000 tokens)
• You're already using OpenAI's API ecosystem

Try Different Scenarios

Use the calculator below to see how costs change with different usage patterns

GPT-5.3 Codex (OpenAI)

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o1 Pro (OpenAI)

Cost Calculator

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Frequently Asked Questions

Which is cheaper, GPT-5.3 Codex or o1 Pro?▼

GPT-5.3 Codex is cheaper for input tokens at $1.75 per million tokens vs $150.00 for o1 Pro — that's 99% savings on input costs.

What is the context window difference between GPT-5.3 Codex and o1 Pro?▼

GPT-5.3 Codex supports 256,000 tokens while o1 Pro supports 200,000 tokens — a difference of 56,000 tokens in favor of GPT-5.3 Codex.

Which model is better for AI Chatbot?▼

Both models support text. For ai chatbot, GPT-5.3 Codex is the lower-cost option, while GPT-5.3 Codex offers a larger context window (256,000 vs 200,000 tokens). Choose GPT-5.3 Codex for budget sensitivity or GPT-5.3 Codex for longer context tasks.

Which model has better overall pricing for heavy usage?▼

At 100 requests/day with 1,000 input and 500 output tokens each, GPT-5.3 Codex costs about $26.25/month and o1 Pro costs about $1,350.00/month. Overall, GPT-5.3 Codex has lower combined input + output rates ($1.75 in, $14.00 out) vs o1 Pro.